diff --git a/lib/recurly/client.php b/lib/recurly/client.php
index 196b3a9b..c003313e 100644
--- a/lib/recurly/client.php
+++ b/lib/recurly/client.php
@@ -123,14 +123,17 @@ public static function apiUrl() {
    */
   public static function disableXmlEntityLoading()
   {
-    $disable = getenv('RECURLY_DISABLE_ENTITY_LOADING');
-    if ($disable === false) {
-        $disable = true;
-    } else {
-        $disable = (bool)$disable;
+      // As of libxml 2.9.0 entity substitution is disabled by default, so there is no need to disable the loading of external entities
+    if (LIBXML_VERSION < 20900) {
+        $disable = getenv('RECURLY_DISABLE_ENTITY_LOADING');
+        if ($disable === false) {
+            $disable = true;
+        } else {
+            $disable = (bool)$disable;
+        }
+
+        libxml_disable_entity_loader($disable);
     }
-
-    libxml_disable_entity_loader($disable);
   }
 
   /**